Antonyms for irrational

Grammar : Adj

Spell : ih-rash-uh-nl

Phonetic Transcription : ɪˈræʃ ə nl

Definition of irrational

Origin : late 15c., "not endowed with reason" (of beats, etc.); earlier (of quantities) "inexpressible in ordinary numbers" (late 14c.); from Latin irrationalis "without reason," from assimilated form of in- "not, opposite of" (see in- (1)) + rationalis "reason" (see rational). Meaning "illogical, absurd" is attested from 1640s. Related: Irrationally.

adj illogical, senseless

Example sentences :

I haven't been irrational, I give you my word, not once since I came here.
Extract from : « The Spenders » by Harry Leon Wilson

This reply seemed to arouse an irrational anger in the Briton.
Extract from : « The Cruise of the Dry Dock » by T. S. Stribling

If men cannot have a rational belief, they will have an irrational.
Extract from : « Laws » by Plato

Pride was irrational, and so was the greater part of human misery.
Extract from : « Mezzerow Loves Company » by Floyd L. Wallace

In spite of his fine manner and bearing, his every word had been irrational.
Extract from : « Elsie Marley, Honey » by Joslyn Gray

The science of healing will become no chance and irrational thing.
Extract from : « The Untroubled Mind » by Herbert J. Hall

What makes you call the blessed quart an irrational quantity?
Extract from : « Stories of Comedy » by Various

It seemed to me that he was foolish and irrational, altogether unlike himself.
Extract from : « Paul Patoff » by F. Marion Crawford

Bright's courage was almost as irrational as that of the rebels themselves.
Extract from : « The Education of Henry Adams » by Henry Adams

It was not a controlled anger, but had something of the irrational in it.
Extract from : « Rebels of the Red Planet » by Charles Louis Fontenay

Synonyms for irrational

Based on : Thesaurus.com - Gutenberg.org - Dictionary.com - Random House Unabridged Dictionary, © Random House, Inc. 2019